Keyphrases
- rdf schema
- rdf data
- xml documents
- semantic web
- resource description framework
- metadata
- dublin core
- xml data
- markup language
- rdf graphs
- xml schema
- data model
- data exchange
- xml databases
- semi structured
- databases
- data integration
- relational data
- xml queries
- query language
- relational databases
- object oriented
- topic maps
- information integration
- relational database systems
- integrity constraints
- database systems
- information systems